CVE-2026-64309 (GCVE-0-2026-64309)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-17 04:53
VLAI
Title
crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)
Summary
In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT) Sashiko notes: > if SEV initialization fails and KVM is actively running normal VMs, could a > userspace process trigger this code path via /dev/sev ioctls (e.g., > SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN > execution for an active VM trigger a general protection fault and crash the > host? The SNP_COMMIT command does not require the firmware to be in any particular state. Skip initializing it if it was previously uninitialized. The SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in Table 5 as a command that is allowed in the UNINIT state, but it is in fact allowed and a future documentation update will reflect that.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7064 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 , < 74768f73854d647a6462f252dc8782ab8a835211 (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 7a361c74bb12f3398c388905f1d325be642cd36e (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 67ed191b4c8bdf432a3f32d1eb302880b4795cd1 (git)
Affected: ceac7fb89e8da465aec3ac3c20477f912f5c3a6c , < 5a1364da2f04217a36e2fdfa2db4ee025b383a20 (git)
Affected: 6.12.75 , < 6.12.96 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)\n\nSashiko notes:\n\n\u003e if SEV initialization fails and KVM is actively running normal VMs, could a\n\u003e userspace process trigger this code path via /dev/sev ioctls (e.g.,\n\u003e SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN\n\u003e execution for an active VM trigger a general protection fault and crash the\n\u003e host?\n\nThe SNP_COMMIT command does not require the firmware to be in any\nparticular state. Skip initializing it if it was previously uninitialized.\n\nThe SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in\nTable 5 as a command that is allowed in the UNINIT state, but it is in fact\nallowed and a future documentation update will reflect that."
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        "id": "CVE-2026-64309",
        "lastModified": "2026-10-24T13:10:00.147",
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                "confidentialityImpact": "NONE",
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      "cve": "CVE-2026-64309",
      "id": "CVE-2026-64309",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_affected": "186",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64309.json",
      "version": "3"
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      "current_release_date": "2026-10-27T01:32:11Z",
      "cve": "CVE-2026-64309",
      "id": "CVE-2026-64309",
      "initial_release_date": "2026-07-25T16:46:03Z",
      "product_status:known_affected": "2",
      "product_status:known_not_affected": "376",
      "product_status:recommended": "149",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64309",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-64309.json",
      "version": "9"
    }
  }
}



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